1. Telecommunications and Networking

2. Learning Objectives 1.Understand the concept of a network. 2.Apply Metcalfe’s law in understanding the value of a network. 3.Identify several major developments and trends in the industries, technologies, and business applications of telecommunications and Internet technologies. 4.Examples of the business value of Internet, intranet, and extranet applications.

3. Learning Objectives 5.Identify the basic components, functions, and types of telecommunications networks used in business. 6.Explain the functions of major components of telecommunications network hardware, software, media, and services. 7.Explain the concept of client/server networking. 8.Understand the two forms of peer-to-peer networking. 9.Explain the difference between digital and analog signals.

4. Learning Objectives 10.Identify the various transmission media and topologies used in telecommunications networks. 11.Understand the fundamentals of wireless network technologies. 12.Explain the concepts behind TCP/IP. 13.Understand the seven layers of the OSI network model.

5. Network Concepts  Network –An interconnected chain, group or system  Number of possible connections on a network is N * (N-1)/2 –Where N = number of nodes (points of connections on the network) –Example, if there are 10 computers on a network, there are 10 * 9/2 = 45 possible connections

6. Telecommunications  Telecommunications –Exchange of information in any form (voice, data, text, images, audio, video) over networks

7. Basic concepts  Communication protocols (TCP/IP)  Data transmission methods –Asynchronous –Synchronous  Connecting –Modem –Hardwired and remote  Data transmission channels (bps) –narrow bands: 5-30 –voice bands: 1,000-9,600 –broad bands: 100,000  Types of communication lines –simplex –half-duplex –duplex

8. Networks  Concept –"a group of interconnected computers, workstations, or computer devices (such as printers and data storage systems).”  Network topology – bus –star – ring  Local-area networks –bus: Ethernet, carrier sense multiple access (CSMA) –ring: token passing method  Distributed data processing –"interconnects sites of one organization not only for communication of data and messages but also for the sharing of resources."

9. Open Systems  Information systems that use common standards for hardware, software, applications and networks  Internet networking technologies are a common standard for open systems  Connectivity: –Ability of networked computers to easily access and communicate with each other and share information  Interoperability: –The ability of an open system to enable end user applications to be accomplished using different varieties of computer systems, software packages, and databases provided by a variety of interconnected networks

10. Middleware  Any programming that serves to “glue together” two separate programs

11. Internet2  Next generation of the Internet  High-performance network  In use at 200 universities, scientific institutions, communications corporations

12. Internet Service Provider  ISP –A company that specializes in providing easy access to the Internet –For a monthly fee, you get software, user name, password and access  ISPs are connect to one another through network access points

13. An Intranet Also look at fig 6.8  A network inside an organization –That uses Internet technologies (such as Web browsers and servers, TCP/IP protocols, HTML, etc.) –To provide an Internet-like environment within the organization –For information sharing, communications, collaboration and support of business processes –Protected by security measures –Can be accessed by authorized users through the Internet

14. Extranet (also look at fig 6.9)  Network links that use Internet technologies –To connect the Intranet of a business –With the Intranets of its customers, suppliers or other business partners

15. GPS 1.The global positioning system (GPS) is a major technological achievement that has broad- reaching implications for business. Using the Internet, –Can find other innovative uses for GPS. –Good places to start familiarizing yourself with current accomplishments are  The GPSWorld site at http://www.gpsworld.com/gpsworld/  The GPS Overview at http://www.colorado.edu/geography/gcraft/notes/gps/ gps_f.html

16. Telecommunications network  Any arrangement where a sender transmits a message to a receiver over a channel consisting of some type of medium

17. Types of Networks  WAN  LAN  VPN  C/S

18. VPN  Basically, a VPN is a private network that uses a public network (usually the Internet) to connect remote sites or users together. Instead of using a dedicated, real-world connection such as leased line, a VPN uses "virtual" connections routed through the Internet from the company's private network to the remote site or employee. routed Source: computer.Howstuffworks.com

19. VPN

20. Internetwork Processors  Switch – makes connections between telecommunications circuits in a network  Router – intelligent communications processor that interconnects networks based on different protocols  Hub – a port switching communications processor  Gateway – connects networks using different communications architectures

21. ROUTERS Routers are specialized computers that send your messages and those of every other Internet user speeding to their destinations along thousands of pathways.  Fujitsu GeoStream R980 industrial strength router

22. ROUTERS configuration table. A configuration table is a collection of information, including:  Information on which connections lead to particular groups of addresses  Priorities for connections to be used  Rules for handling both routine and special cases of traffic A router, then, has two separate but related jobs:  The router ensures that information doesn't go where it's not needed. This is crucial for keeping large volumes of data from clogging the connections of "innocent bystanders."  The router makes sure that information does make it to the intended destination. Computer.howstuffworks.com

23. Distributed data processing TSS - Time Sharing Systems CSS - Client Server Systems PC MAINFRAME PC

24. Client/Server networks  Clients: End user personal computers or networked computers  Interconnected by LANs  Servers: manage networks  Processing shared between clients and servers

25. CSS architecture PC L A N File Server Print Server Communica- tions Server Remote Server

26. Peer-to-peer networks (p 209)  Networks that connect from one PC to another PC Peer-to-peer networking enables or enhances the following scenarios:  Real-time communications (RTC)  Collaboration  Content distribution  Distributed processing  Improved Internet technologies Source: www.microsoft.com

27. Wireless Technologies  Terrestrial microwave –Earthbound microwave systems that transmit high-speed radio signals in a line-of-sight path –Between relay systems spaced approximately 30-miles apart  Communications satellites –Satellite serves as relay stations for communications signals –Uses microwave radio signals

28. Wireless Technologies  Cellular and PCS telephone and pager systems –Divide the geographic area into small areas or cells –Each cell has transmitter or radio relay antenna to send message from one cell to another  Wireless LANs –Radio signals within an office or building –Connect PCs to networks  Bluetooth –Short-range wireless technology –To connect PC to peripherals such as printer

29. Bluetooth  Bluetooth is a standard developed by a group of electronics manufacturers that allows any sort of electronic equipment -- from computers and cell phones to keyboards and headphones -- to make its own connections, without wires, cables or any direct action from a user. cell phoneskeyboardscell phoneskeyboards  Bluetooth can connect up to eight devices simultaneously. With all of those devices in the same 10-meter (32-foot) radius

30.  http://www1.us.dell.com/content/topics/globa l.aspx/solutions/en/truemobile?c=us&cs=04 &l=en&s=bsd http://www1.us.dell.com/content/topics/globa l.aspx/solutions/en/truemobile?c=us&cs=04 &l=en&s=bsd http://www1.us.dell.com/content/topics/globa l.aspx/solutions/en/truemobile?c=us&cs=04 &l=en&s=bsd

31. Cell Phones  GSM (CDMA) vs TDMA  Cell vs Mobile

32. GSMCDMADigitalYESYES Network Type P-GSM 900 (primary) 900MHz band CDMA 800, 800MHz band (X1 is available.. but is not being talked about here) Maximum talk range from a tower (pls. note you will need a carkit for your mobile to achieve these numbers in some cases) 35KM (stock cell) 70KM ER, EER 105KM possible with special towers Approx 110KM Background Noise suppression YES (Included in EFR) YES Talk Time Higher due to DTX and the "pulse" nature of TDMA. Lower due to CDMA transmitting all the time. Standby Times Higher due the "pulse" nature of TDMA High International Roaming YES (over 138 GSM countries world wide) VERY LOW 15? World wide customers 200 Mil 35 Mil SMSYESYES Fax + Data YESYES Built in "Intelligence" HIGHMEDIUM

33. EDI Concepts  EDI is a mechanism for electronic trading  EDI replaces paper flow with online transactions  EDI architecture ----> see next slide  EDI is for trading partners  Implementation plan is a key factor  Obstacles: –lack of transaction standardization –high start-up costs  EDI third-party suppliers –AT&T, Control Data, EDS, GE, Western Union, IBM, Martin Marietta Data Systems, etc.

34. EDI architecture

35. Network Topologies (p 219)  Topology: structure of a network  Star: ties end user computers to a central computer  Ring: ties local computer processors together in a ring on a relatively equal basis  Bus: local processors share the same communications channel

36. Network Architectures & Protocols  Protocol: standard set of rules and procedures for the control of communications in a network  Network Architecture: –Master plan of standard protocols, hardware, software and interfaces between end users and computer systems –Goal of promoting an open, simple, flexible, and efficient telecommunications environment

37. OSI & TCP/IP Models (p 221)  Open Systems Interconnection (OSI) Model –A seven-layer model that serves as a standard model for network architectures –Model for how messages should be transmitted between two points in a network –Each layer adds functions  Transmission Control Protocol / Internet Protocol (TCP/IP) –A five layer telecommunications protocol used by the Internet

38. IP Internet protocol  Each system connected to the internet is identified by a 32-bit IP address  Four numbers separated by a decimal Each represented by octal (8 bits; hence 0-255)  Ex: 168.212.226.204 Binary format: 10101000.11010100.11100010.11001100. A new protocol IPv6 allows for 128 bit IP addresses to look up an IP address :http://www.kloth.net/services/nslookup.php to look up an IP address :http://www.kloth.net/services/nslookup.php http://www.kloth.net/services/nslookup.php to find info: to find info: http://www.geobytes.com/IpLocator.htm

39. Basic Communications Model Standards are needed at all Layers

40. Internet Telephony  Using an Internet connection to pass voice data using IP  Voice over IP (VoIP)  Skips standard long-distance phone charges

41. VOIP (source www.fcc.gov)

42. Bandwidth  Bandwidth –Frequency range of a telecommunications channel –Determines transmission rate –Classified in bits per second (bps)  Transmission Rates: –Narrow-band – low-speed –Broadband – high-speed

43. WiFi  WIreless FIdelity (WiFi)-- used generically when referring of any type of 802.11 802.11 "Wi-Fi Certified" (a registered trademark) by the Wi-Fi Alliance are interoperable with each other, Wi-FiCertifiedWi-FiCertified even if they are from different manufacturers. A user with a "Wi-Fi Certified" product can use any brand of access point with any other brand of client hardware that also is certified access point hardwareaccess point hardware http://www.webopedia.com/TERM/W/Wi_Fi.html

44. Additional Readings  Voice over data networks Voice over data networks Voice over data networks  Networking Hardware Quiz  Networking Hardware Quiz Networking Hardware Quiz Networking Hardware Quiz  abc of wireless LAN abc of wireless LAN abc of wireless LAN  ISDN Tutorial ISDN Tutori ISDN Tutori  Ethernet tutorial Ethernet tutorial Ethernet tutorial  Internet Protocol Internet Protocol Internet Protocol  Thin clients Thin clients Thin clients  UNIX/NT integration UNIX/NT integrationUNIX/NT integration  Cell phones Cell phones Cell phones

45. RWC 1: SAIC, Hewlett-Packard, GE, and Others: Wireless, Wireless Everywhere What are some of the business benefits associated with using wireless networks to collect and transmit data? Benefits would include”  Superfast wireless connections to the Web.  Cost is about one-fourth of existing costs for connection to the Web.  Productivity gains such as a 45% gain at UPS.

46. What are some of the challenges being faced in this use of wireless technologies? What solutions can you offer?  Having everyone online in a meeting can be toxic to productivity. “No laptop” policies for important meetings.  Enormous pressure within companies to provide Wi-Fi in all areas of the company. Which employees have compelling needs for Wi-Fi access  Cost exceeds the benefit to be gained by providing Wi-Fi such as in a manufacturing plant that would require numerous additional access points than usual.  Security of information available via the Wi-Fi system. Delay implementation until security assurances are met.

47. The use of wireless networking as described in the case is both innovative and useful. What other business uses can you envision for this approach?

48. RWC 2: Maryland and Colorado: Serving Its Citizens Without Using Wires 1.What is the business value of advanced mobile technologies to Maryland’s emergency management services?  Direct agents toward places where their presence is required  Give notice of impending natural disasters with forecasts and instructions on how to proceed.  Improve information gathering on the extent and magnitude of devastation.  Reduce the amount of manual data-entry, leading to improved response times and reduction of errors (i.e. address is automatically captured and pop-up menus limit possible answers).

49. In what other government services could GPS serve to provide business value? Give some examples.  States’ National Guards, to monitor and direct personnel in case of an emergency.  Emergency Services, to direct ambulances, firefighters, etc.  Department of Treasury / Federal Reserve, to track the location of armored trucks both for regular traffic and in case of a hijacking.  The military in general, given that it has one of the largest manpower and logistics network in the country.

50. Are there disadvantages or risks associated with the deployment of GPS systems to monitor the location of people? Explain.  Invasions of privacy  Limitation on the freedom of movement  Could allow not only the government but also private individuals to monitor other people’s movements.